To return the total of UnitsProduced aggregated by ProductName, which SQL query approach should be used?

The correct approach to return the total of UnitsProduced aggregated by ProductName is to utilize a SELECT query that includes the SUM function along with a GROUP BY clause. While the answer indicated is not explicitly mentioned, we can infer the correct methodology that aligns with the answer.

Using a SELECT query with the SUM function allows you to calculate the total number of units produced. The aggregation requires a GROUP BY clause to ensure that the total is computed for each unique ProductName. This approach effectively consolidates the data, allowing for an easy overview of production totals associated with each product.

In this scenario, using two SELECT queries with a UNION ALL clause would not be appropriate because UNION ALL is typically used for combining the results of multiple queries rather than aggregating data by grouping. Similarly, employing a WHERE clause would filter rows based on specific conditions rather than aggregating totals. Therefore, selecting from the table with the appropriate aggregation function is the most effective and standard way to achieve the desired result for this particular data requirement.